<template>
  <div>
    <span v-for="(item,index) in arr" :key="index">
      <input v-model="num" type="checkbox" :value="item">{{item}}
    </span>
    <p>你选中的元素,累加的值和为{{total}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      num:[],
    };
  },
  computed:{
    total(){
      return this.num.reduce((prev,item)=>prev+=item,0)
    }
  }

};
</script>

<style lang="scss" scoped>

</style>